I'd actually avoid those if possible, because they have a lot of N in them and you don't want to give too much to your plants. Some people use them to feed plants in hard-to-reach areas during the summer, while the plants are still vegging.
Also be careful of concentrated feedings. If you want something that will permeate into the soil, what I do is take bat guano and put it in a shaker can like one that grated parmesan cheese came in, and shake it lightly over the soil surface. When it rains, the nutrients will leach into the root zone.
Or you could just water with fertilizer mixed at the strenght on the bottle- a bloom fert like pure blend pro bloom that has a lot of organics in it will be nice for you.